There's also the fact that the Avatar is the bridge between the natural world and the spirit world and Jesus is both man (natural) and God (spirit). Plus, they can both walk on water and communicate with spirits.

Lol Avatar definitely draws more from Peter Pan because he can fly and stays young for almost 100 years. Also in the first season his nemesis follows him on a ship and has a noticable physical injury just like Captain Hook. Also his friends are also kids just like Peter Pan and Momo is just like Tinkerbell.